Coherent light generators – Particular resonant cavity – Specified output coupling device
Patent
1990-01-12
1991-04-09
Scott, Jr., Leon
Coherent light generators
Particular resonant cavity
Specified output coupling device
372 26, 372 99, 372 75, 372 69, 372 43, H01S 308
Patent
active
050070665
ABSTRACT:
A semiconductor laser apparatus includes a semiconductor laser for emitting a light beam. The semiconductor laser has, as an external cavity, a quadruple light wave mixing optical phase conjugate element for inverting a spatial phase of an incident light beam. The apparatus further includes a pair of pump light sources which are arranged such that a superimposed portion of spectra of wavelengths of three light beams including two pump light beams emitted from the pair of pump light sources and entering into the optical phase conjugate element and another light beam emitted from the semiconductor laser is narrower than the spectral width of wavelengths of each of the three light beams. This enables the laser apparatus to generate an oscillating output wavelength of extremely narrow spectral width.
REFERENCES:
patent: 4913547 (1990-04-01), Moran
"Spectral Characteristics of External-Cavity Controlled Semiconductor Lasers", Fleming et al., IEEE Journal of Quantum Electronics, vol. QE-17, No. 1, Jan. 1981, pp. 44-59.
"Phase Conjugate Optics and Real-Time Holography", A. Yariv, IEEE Journal of Quantum Electronics, vol. QE-14, No. 9, Sep. 1978, pp. 650-660.
"CW Operation of Distributed-Feedback GaAS-GaAlAs Diode Lasers at Temperatures up to 300 K", Nakamura et al., Applied Physics Letters, vol. 27, No. 7, Oct. 1975, pp. 403-405.
Jr. Leon Scott
Matsushita Electric - Industrial Co., Ltd.
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